/*
 * Copyright (c) 2023-2025 elsfs Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.elsfs.cloud.starter.excel.converters;

import cn.idev.excel.converters.Converter;
import cn.idev.excel.enums.CellDataTypeEnum;
import cn.idev.excel.metadata.GlobalConfiguration;
import cn.idev.excel.metadata.data.ReadCellData;
import cn.idev.excel.metadata.data.WriteCellData;
import cn.idev.excel.metadata.property.ExcelContentProperty;
import cn.idev.excel.util.DateUtils;
import java.text.ParseException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/** LocalDateTime and string converter */
public enum LocalDateTimeStringConverter implements Converter<LocalDateTime> {

  /** 实例 */
  INSTANCE;

  private static final String MINUS = "-";

  @Override
  public Class supportJavaTypeKey() {
    return LocalDateTime.class;
  }

  @Override
  public CellDataTypeEnum supportExcelTypeKey() {
    return CellDataTypeEnum.STRING;
  }

  @Override
  public LocalDateTime convertToJavaData(
      ReadCellData cellData,
      ExcelContentProperty contentProperty,
      GlobalConfiguration globalConfiguration)
      throws ParseException {
    String stringValue = cellData.getStringValue();
    String pattern;
    if (contentProperty == null || contentProperty.getDateTimeFormatProperty() == null) {
      pattern = switchDateFormat(stringValue);
    } else {
      pattern = contentProperty.getDateTimeFormatProperty().getFormat();
    }
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
    return LocalDateTime.parse(cellData.getStringValue(), formatter);
  }

  @Override
  public WriteCellData<String> convertToExcelData(
      LocalDateTime value,
      ExcelContentProperty contentProperty,
      GlobalConfiguration globalConfiguration) {
    String pattern;
    if (contentProperty == null || contentProperty.getDateTimeFormatProperty() == null) {
      pattern = DateUtils.DATE_FORMAT_19;
    } else {
      pattern = contentProperty.getDateTimeFormatProperty().getFormat();
    }
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);
    return new WriteCellData<>(value.format(formatter));
  }

  /**
   * switch date format
   *
   * @param dateString dateString
   * @return pattern
   */
  private static String switchDateFormat(String dateString) {
    int length = dateString.length();
    switch (length) {
      case 19:
        if (dateString.contains(MINUS)) {
          return DateUtils.DATE_FORMAT_19;
        } else {
          return DateUtils.DATE_FORMAT_19_FORWARD_SLASH;
        }
      case 17:
        return DateUtils.DATE_FORMAT_17;
      case 14:
        return DateUtils.DATE_FORMAT_14;
      case 10:
        return DateUtils.DATE_FORMAT_10;
      default:
        throw new IllegalArgumentException("can not find date format for：" + dateString);
    }
  }
}
